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To find the total floor area \( n \) of all the offices in the building, you would multiply the number of offices by the floor area of each office.
The correct equation would be:
\[
23 \times 305 = n
\]
Calculating that gives:
\[
n = 23 \times 305 = 7,015 \text{ square feet}
\]
So the correct choice is:
\[
23 \times 305 = n, \, n = 7,015 \text{ square feet}
\]